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2 years ago

If I touch a hot object, my hand gets hot through which type of heat transfer?

2 answers:

6 0

If you touch a hot object, the heat is transferred from the object to your hand through conduction. (This is the actual answer.)

mamaluj [8]2 years ago

4 0

Answer:

Thermal Transfer.

Explanation:

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What has to happen in order for dew to form on grass?

jeka57 [31]

It has to be moist in the grass

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2 years ago

What is the correct classification of a mixture in which both a solid and liquid are visible?

Setler [38]

The answer is D.

"a heterogeneous mixture and a suspension"

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3 years ago

An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound

Softa [21]

Answer: Ca3(PO4)2

Explanation:

We assume that the sample is 100.0 g.

The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.

Then we can calculate the number of moles of each component (n = m/atomic mass).

The number of moles of Ca = 38.7/40.078 = 0.96 mol.

The number of moles of P = 19.9/30.97 = 0.64 mol.

The number of moles of O = 41.2/15.99 = 2.75 mol.

Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).

Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.

To avoid the fraction of the ratios, we can multiply all ratios by 2.0.

Now, the ratio of Ca : P : O will be 3 : 2 : 8.

That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).

8 0

2 years ago

A blank is a possible explanation for a set of observations or answer to a scientific question

Sav [38]

"Possible explanation" gives you a clue.

It is A Hypothesis because it an education guess or possible explanation to a question.

4 0

2 years ago

Describe the formation of an image in a pinhole camera

Alla [95]

Answer:

Explanation:

A pinhole camera is a simple camera without a lens but with a tiny aperture, a pinhole camera – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.

8 0

2 years ago